The dispatching system based on power packet transmission in the DC distribution network realizes the efficient allocation of electric energy. However, due to the intermittent nature of packet energy supply, the problem of energy storage buffer becomes critical. This paper focuses on the analysis of the energy storage buffer capacity in the DC power packet transmission system. The first-order circuit three-element method is used to derive the capacitance capacity expression, which is applied to the power packet system to obtain the buffer capacity range, and the relationship between the buffer and the load is established. Based on its relationship, the problem of the number of loads that the system can accommodate is analyzed from the perspective of time division multiplexing. Finally, Matlab software is used to theoretically analyze the mathematical relationship. The results show that the demand for more loads can be met by reducing the payload duration of the power packet and the like. To a certain extent, this research has reduced investment costs and enabled the effective use of power resources. This work is supported byNational Natural Science Foundation of China (No. 61501185) and Science and Technology Project of State Grid Hebei Electric Power Supply Co., Ltd. (No. SGHEHS00FCJS1800274).